is this is a RAID problem ??

HuMan-BiEnG · 05-07-2012, 03:01 AM

Hello there,

i just reinstalled linux OS (CentOS 5.8) & with RAID level 1 implemented

this is my second time dealing with RAID level 1 !

now, i have the following file systems

Code:

Filesystem            Size  Used Avail Use% Mounted on
/dev/md2              100G  1.1G   94G   2% /
/dev/md1              496M   41M  430M   9% /boot
/dev/md3              2.0T  199M  1.9T   1% /vz

as you can see the server is HN which going to use OpenVZ virtualization software

i have installed OpenVZ but it couldnt start yet becuase RAID is resyncing MD3 but it taking long time & so other MDs are delayed until MD3 finish !!

as shown

Code:

md0 : active raid1 sdb1[1] sda1[0]
      33553344 blocks [2/2] [UU]
        resync=DELAYED

md1 : active raid1 sdb2[1] sda2[0]
      524224 blocks [2/2] [UU]
        resync=DELAYED

md3 : active raid1 sdb5[1] sda5[0]
      2146434944 blocks [2/2] [UU]
      [===========>.........]  resync = 58.6% (1257908224/2146434944) finish=149.3min speed=99159K/sec

md2 : active raid1 sdb3[1] sda3[0]
      104857536 blocks [2/2] [UU]
        resync=DELAYED

my question now :

is the resync process will always bother me everytime when we put or install something in /vz (MD3)?

or this is just will happen once after enabling RAID ?

or this is because the MD3 array size is too big (its actuall size is 2 TB * 2)?

or this is a problem in RAID ?

ps, i have raised up RAID writing limits to be 1 GB per/s

please all accept my best regards,,

zer0signal · 05-07-2012, 04:38 AM

No, it wont do this every time you install or put something on the /VZ mount point. The only time it should rebuild or resync is when a new disk is added to the array... If you take these exact disks/partitions and put them in to another linux system, mdadm should find and set them up properly with out a resync/rebuild.

HuMan-BiEnG · 05-07-2012, 08:52 AM

Hello zer0signal,

first, thank you man so much for your kind help

second, i have a nother question please

should i didnt write or install something in a raid array while it resync ?

because when the resync process was currently working i installed OpenVZ ,which installed in /vz partition (MD3), but i didnt found OpenVZ run time script also didnt found any structures or folders under /vz

so, is this because i shouldnt write or install something on raid array when it is resyncing & instead have to wait resync process to be finished ?

please accept my best regards

zer0signal · 05-07-2012, 02:09 PM

Writing to that Partition while its rebuilding/resync is not going to hurt anything.... But you wont get the performance till its done resyncing, I normally just let the rebuild run and then play with it once its done.

Did you format the /VZ partition yet?

mkfs.ext4 /dev/md3

?

HuMan-BiEnG · 05-07-2012, 02:24 PM

Quote:

Originally Posted by zer0signal

Writing to that Partition while its rebuilding/resync is not going to hurt anything.... But you wont get the performance till its done resyncing, I normally just let the rebuild run and then play with it once its done.

Did you format the /VZ partition yet?

mkfs.ext4 /dev/md3

?

Hello zer0signal,

yeah man the /vz partition exists with ext4 filesystem

but when installed OpenVZ while resync is working i didnt found OpenVZ init script niether found any directories under /vz

now, i did nothing except waiting for resync process to be finished

then i will reinstall OpenVZ again & see what will happen !!

please accept my best regards,,